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Linux Bash Shell

06/24/19

Defining a variable with or without export?

What is `export` for? What is the difference between: export name=value and name=value

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Answers •1

Linux Time Filesystems Recursion

06/21/19

How to recursively find and list the latest modified files in a directory with subdirectories and times?

- Operating system: Linux - Filesystem type: ext3 - Preferred solution: bash (script/oneliner), ruby, python I have several directories with several subdirectories and files in them. I need to... more

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Answers •1

Linux Environment Variables Sudo

06/21/19

How to keep environment variables when using sudo?

When I use any command with sudo the environment variables are not there. For example after setting HTTP_PROXY the command `wget` works fine without `sudo`. However if I type `sudo wget` it says it... more

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Answers •3

Linux Shell

06/20/19

How can I recursively find all files in current and subfolders based on wildcard matching?

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Answers •2

Linux Bash Datetime

06/20/19

Get current time in seconds since the Epoch on Linux, Bash?

I need something simple like `date`, but in seconds since 1970 instead of the current date, hours, minutes, and seconds. `date` doesn't seem to offer that option. Is there an easy way?

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Answers •1

Linux Shell

06/20/19

Why doesn't "cd" work in a shell script?

I'm trying to write a small script to change the current directory to my project directory: #!/bin/bash cd /home/tree/projects/java I saved this file as proj, added execute permission with... more

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Answers •2

Linux Stream Pipe Bash

06/20/19

How can I redirect and append both stdout and stderr to a file with Bash?

To redirect *stdout* to a truncated file in Bash, I know to use: cmd > file.txt To redirect *stdout* in Bash, appending to a file, I know to use: cmd >> file.txt To redirect both... more

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Answers •1

Linux Docker

06/19/19

Docker can't connect to docker daemon?

After I update my Docker version to `0.8.0`, I get an error message while entering `sudo docker version`: Client version: 0.8.0 Go version (client): go1.2 Git commit (client): cc3a8c8 ... more

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Answers •1

Linux Terminal Ubuntu Gnome Terminal

06/19/19

Clear a terminal screen for real?

Using the `clear` command on the terminal only fools the user into thinking the screen has been cleared...you can still see output from the previous commands when you scroll using the mouse. This... more

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Answers •1

Linux Ubuntu Shell File

06/18/19

How to append one file to another in Ubuntu Linux?

I have two files: `file1` and `file2`. How do I append the contents of `file2` to `file1` so that contents of `file1` persist the process?

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Answers •2

Linux Process Signals Shell

06/13/19

What's the best way to send a signal to all members of a process group?

I want to kill a whole process tree. What is the best way to do this using any common scripting languages? I am looking for a simple solution.

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Answers •1

Linux Video Production Editing Video

06/12/19

120fps 720p footage with real time playback on Ubuntu? + editing?

I have a laptop with an i7 CPU, 1.73 GHz, 8GB RAM, Ubuntu 10.04 with an "ATI Mobility Radeon HD 5800 Series" graphics card. I have compiz enabled (which may be one of the culprits with the problem... more

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Answers •1

Linux

06/12/19

Recursively counting files in a Linux directory?

How can I recursively count files in a Linux directory? I found this: find DIR_NAME -type f ¦ wc -l But when I run this it returns the following error. > find: paths must precede... more

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Answers •1

Linux Bash Shell Sh

06/12/19

What does set -e mean in a bash script?

I'm studying the content of this **preinst** file that the script executes before that package is unpacked from its Debian archive (.deb) file. The script has the following code: #!/bin/bash ... more

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Answers •1

Linux Bash Cp

06/12/19

How to have the cp command create any necessary folders for copying a file to a destination?

When copying a file using `cp` to a folder that may or may not exist, how do I get `cp` to create the folder if necessary? Here is what I have tried:  [root@file... more

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Answers •1

Linux Bash Shell

06/11/19

Get program execution time in the shell?

I want to execute something in a linux shell under a few different conditions, and be able to output the execution time of each execution. I know I could write a perl or python script that would... more

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Answers •2

Linux Php Php Ini

06/05/19

Where is my php.ini file located on the server?

A few years ago I installed Apache 2.2x and PHP 5.3.1 on a Linux server I maintain. I used .tar.gz's and built them as instructed (instead of rpms and what-have-you). And all was fine. Today I... more

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Answers •1

Linux Folder Permissions Chmod

06/05/19

How do I change permissions for a folder and all of its subfolders and files in one step in Linux?

I would like to change permissions of a folder and all its sub folders and files in one step (command) in Linux. I have already tried the below command but it works only for the mentioned... more

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Answers •1

Linux Bash

06/05/19

Bash ignoring error for a particular command?

I am using following options set -o pipefail set -e In bash script to stop execution on error. I have 100 of script executing and I don't want to check return code of the script. But for a... more

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Answers •1

Linux Shell Tar Archive

06/04/19

Shell command to tar directory excluding certain files/folders?

Is there a simple shell command/script that supports excluding certain files/folders from being archived? I have a directory that need to be archived with a sub directory that has a number of very... more

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Answers •1

Linux Scripting Bash Shebang

06/04/19

Why do you need to put #!/bin/bash at the beginning of a script file?

I have made [Bash][1] scripts before and they all ran fine without this at the beginning. What's the point of putting it in? Would things be any different? Also, how do you pronounce `#`? I know... more

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Answers •1

Linux Unix Bash Filenames

06/02/19

Extract file basename without path and extension in bash?

Given file names like these: /the/path/foo.txt bar.txt I hope to get: foo bar Why this doesn't work? #!/bin/bash fullfile=$1 fname=$(basename $fullfile) fbname=${fname%.*} echo... more

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Answers •1

Linux Unix Diff Bash

05/30/19

Given two directory trees, how can I find out which files differ?

If I want find the differences between two directory trees, I usually just execute: diff -r dir1/ dir2/ This outputs exactly what the differences are between corresponding files. I'm interested... more

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Answers •1

Linux Unix Bash Grep

05/29/19

How can I format my grep output to show line numbers at the end of the line, and also the hit count?

I'm using grep to match string in a file. Here is an example file: example one, example two null, example three, example four null, `grep -i null myfile.txt` returns example two null, ... more

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Answers •1

Linux Find Shell

05/28/19

How to exclude a directory in find . command?

I'm trying to run a `find` command for all JavaScript files, but how do I exclude a specific directory? Here is the `find` code we're using. for file in $(find . -name '*.js') do java -jar... more

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Answers •2

Defining a variable with or without export?

How to recursively find and list the latest modified files in a directory with subdirectories and times?

How to keep environment variables when using sudo?

How can I recursively find all files in current and subfolders based on wildcard matching?

Get current time in seconds since the Epoch on Linux, Bash?

Why doesn't "cd" work in a shell script?

How can I redirect and append both stdout and stderr to a file with Bash?

Docker can't connect to docker daemon?

Clear a terminal screen for real?

How to append one file to another in Ubuntu Linux?

What's the best way to send a signal to all members of a process group?

120fps 720p footage with real time playback on Ubuntu? + editing?

Recursively counting files in a Linux directory?

What does set -e mean in a bash script?

How to have the cp command create any necessary folders for copying a file to a destination?

Get program execution time in the shell?

Where is my php.ini file located on the server?

How do I change permissions for a folder and all of its subfolders and files in one step in Linux?

Bash ignoring error for a particular command?

Shell command to tar directory excluding certain files/folders?

Why do you need to put #!/bin/bash at the beginning of a script file?

Extract file basename without path and extension in bash?

Given two directory trees, how can I find out which files differ?

How can I format my grep output to show line numbers at the end of the line, and also the hit count?

How to exclude a directory in find . command?

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